192.168.55.2这一个给上网,cisco7206,(E0/0外网,F1/1.1vlan34 F1/1.2vlan35 F1/1.3vlan36F1/1C2950F0/1相连)下面挂一个CISCO2950 想通过这一个ip把多网段主机都上网,vlan34 10.10.3.Xvlan35 10.10.4.Xvlan36 10.10.5.X(VLANC2950上做好了已经)

(config)#int F1/1.1 / F1/1.1 子接口

()# encapsulation dot1Q 34/封装属于VLAN34

(config-if)#ip address 10.10.3.1 255.255.255.0

(config-if)#ip nat inside /设置为内网
(config-if)#no sh
(config-if)#exit

(config)#int F1/1.2 / 配置F1/1.2 子接口

(config-if)# encapsulation dot1Q 35/封装属于VLAN35

(config-if)#ip address 10.10.4.1 255.255.255.0

(config-if)#ip nat inside /设置为内网
(config-if)#no sh
(config-if)#exit

(config)#int F1/1.3 / 配置F1/1.3 子接口

(config-if)# encapsulation dot1Q 36/封装属于VLAN36

(config-if)#ip address 10.10.5.1 255.255.255.0

(config-if)#ip nat inside /设置为内网
(config-if)#no sh
(config-if)#exit

(config)#int E0/0

(config-if)# ip address 192.168.55.2 255.255.255.128*外网端口,假设192.168.55.2为外部上网IP

(config-if)#ip nat outside /设置为外网

(config-if)#no sh
(config-if)#exit

(config)#ip nat pool zytvoa 192.168.55.2 192.168.55.2 netmask 255.255.255.128 /设置外部地址池始地址掩码
(config)#access-list 1 permit 10.10.0.0 0.0.255.255 /
配置内网口段范围
(config)#ip nat inside source list 1 pool zytvoa overload/
配置PAT
(config)#ip route 0.0.0.0 0.0.0.0
Ethernet0/0 192.168.55.1/配置默认路由下一跳(网关)

C7206完成后配置

interface Ethernet0/0*外网端口,假设192.168.55.2为外部上网IP

ip address 192.168.55.2 255.255.255.128

ip nat outside*

ip virtual-reassembly

duplex auto

!

interface GigabitEthernet0/0

no ip address

duplex full

speed 1000

media-type gbic

negotiation auto

!

interface FastEthernet1/0

ip address 10.10.1.1 255.255.255.0

ip nat inside

ip virtual-reassembly

duplex half

!

interface FastEthernet1/1

no ip address

duplex half

!

interface FastEthernet1/1.1

encapsulation dot1Q 34

ip address 10.10.2.1 255.255.255.0

ip nat inside

ip virtual-reassembly

!

interface FastEthernet1/1.2

encapsulation dot1Q 35

ip address 10.10.3.1 255.255.255.0

ip nat inside

ip virtual-reassembly

!

interface FastEthernet1/1.3

encapsulation dot1Q 36

ip address 10.10.4.1 255.255.255.0

ip nat inside

ip virtual-reassembly

!

interface ATM2/0

no ip address

shutdown

no atm ilmi-keepalive

!

ip route 0.0.0.0 0.0.0.0 Ethernet0/0 192.168.55.1

!

no ip http server

no ip http secure-server

!

ip nat pool zytvoa 192.168.55.2 192.168.55.2 netmask 255.255.255.128

ip nat inside source list 1 pool zytvoa overload

!

access-list 1 permit 10.10.0.0 0.0.255.255